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A New Species of the Armored Catfish Genus Pareiorhaphis Miranda Ribeiro (Siluriformes: Loricariidae) from the Rio Paraguaçu, Bahia State, Northeastern Brazil

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A New Species of the Armored Catfish Genus Pareiorhaphis Miranda Ribeiro (Siluriformes: Loricariidae) from the Rio Paraguaçu, Bahia State, Northeastern Brazil Neotropical Ichthyology, 12(1):35-42, 2014 Copyright © 2014 Sociedade Brasileira de Ictiologia A new species of the armored catfish genus Pareiorhaphis Miranda Ribeiro (Siluriformes: Loricariidae) from the rio Paraguaçu, Bahia State, northeastern Brazil Edson H. L. Pereira1 and Angela M. Zanata2 A new armored catfish species of the genus Pareiorhaphis is described from the middle and upper portions of rio Paraguaçu basin, coastal drainage of Bahia State, northeastern Brazil. The new species is readily distinguished from all its congeners by having two putative autapomorphies: (1) skin fold just posterior to each emergent tooth series of dentary formed by a single enlarged, flattened papilla, and (2) the midline of lower lip immediately behind the dentaries with small patch of distinct papillae arranged in a short median bump. In addition, the shallow caudal peduncle and comparatively lower number of teeth in each dentary also distinguishes the new species from all congeners. The new species is also compared to Pareiorhaphis bahianus, the geographically closest congener. Uma espécie nova de cascudo do gênero Pareiorhaphis é descrita da porção média e superior da bacia do rio Paraguaçu, drenagem costeira do estado da Bahia, nordeste do Brasil. A espécie nova é facilmente diagnosticada das demais congêneres por apresentar duas possíveis autapomorfias: (1) uma prega de pele atrás de cada série emergente de dentes do dentário formada por uma única papila larga e achatada e (2) um conjunto de papilas distintas arranjadas em uma elevação curta localizada na linha média do lábio inferior. Além disso, a menor altura do pedúnculo caudal e o baixo número de dentes em cada dentário também distinguem a espécie nova de todas as congêneres. A espécie nova é ainda comparada com Pareiorhaphis bahianus, congênere geograficamente mais próximo. Key words: Cascudos, Chapada Diamantina, Neoplecostominae, Neoplecostomus, Pareiorhaphis bahianus. Introduction to southern drainages, with at least nine species occurring in Santa Catarina State, in the last two decades six new species Pareiorhaphis Miranda Ribeiro currently comprises were revealed to occur in rivers draining a more northeastern 21 nominal valid species of small to medium-sized portion of the country (e.g., rio Doce, rio Jequitinhonha, and suckermouth armored catfishes easily recognized by a rio São Francisco drainages), and two small coastal rivers of series of derived features, including cheeks, opercle, and the Espírito Santo State, named Piraquê-Açu and Reis Magos. the exposed lateral process of the cleithrum of adult males Up to date, P. bahianus (Gosline) described from Fazenda covered with hypertrophied odontodes, and the lateroventral Almada, Ilhéus, is the only species known to occur in Bahia portion of preopercle deeply rugose due to the attachment State and represents the northernmost distribution record of of hypertrophied odontodes (Pereira et al., 2007, 2010). the genus. The type locality of P. bahianus is within the area Species of Pareiorhaphis are almost completely restricted drained by the rio Almada and this species is recorded from to rivers draining the Brazilian Shield, with the exception various small coastal rivers located between the rio Pardo and of P. regani (Giltay), which was described from a tributary rio de Contas basins (Carvalho & Bockmann, 2007). of the rio Negro, in the Amazon basin. Although the highest Field expeditions over the last eight years in coastal species diversity of the genus has been traditionally attributed drainages of Bahia State yielded several undescribed species 1Laboratório de Sistemática de Vertebrados, Pontifícia Universidade Católica do Rio Grande do Sul. Av. Ipiranga, 6681, P. O. Box 1429, 90619-900 Porto Alegre, RS, Brazil. [email protected] 2Departamento de Zoologia, Instituto de Biologia, Universidade Federal da Bahia. Rua Barão de Geremoabo, s/n, Ondina, 40170-290 Salvador, BA, Brazil. [email protected] 35 36 New Pareiorhaphis from northeastern Brazil of armored catfishes, revealing an unknown diversity of Paratypes. All from Brazil, Bahia State, rio Paraguaçu basin. MCP loricariids in the area. This fact can be exemplified by 47712, 18, 30.1-82.1 mm SL (6, 63.1-82.1 mm SL), 1 c&s, 64.1 mm SL, and UFBA 7063, 25, 31.0-71.8 mm SL (3, 66.5-71.8 mm SL), discoveries of two new species of Hypostomus describe collected with the holotype. MCP 48004, 3, 72.6-81.8 mm SL, 1 c&s, recently (Birindelli et al., 2007; Zanata et al., 2013) and a 72.6 mm SL, rio Paraguaçu at Fazenda Os Touros, ca. 18 km from new species of Pareiorhaphis described herein. Iaçu, 12°41’10”S 40°7’47”W, 143 m a.s.l., Sep 2011, J. J. S. Conceição. MZUSP 86089, 3, 45.5-57.8 mm SL, rio Paraguaçu, upstream Itaetê, Material and Methods 12°58’25”S 40°58’20”W, 21 Sep 2004, M. E. Bichuette et al. MZUSP 86154, 1, 62.8 mm SL, rio Paraguaçu, upstream Itaetê, 12°58’25”S 40°58’20”W, 8 Nov 2004, M. E. Bichuette & F. D. Passos. MZUSP All morphometric features were taken as point- 88163, 10, 54.8-71.4 mm SL; UFBA 7026, 5, 54.2-62.5 mm SL, rio to-point linear distances with digital calipers under a Paraguaçu at Fazenda Os Touros, ca.18 km from Iaçu, 12°41’10”S stereomicroscope, and recorded to the nearest 0.1 mm. 40°7’47”W, 143 m a.s.l., 8 Jun 2005, A. M. Zanata, J. L. O. Birindelli, Counts and measurements followed Pereira et al. (2007). O. T. Oyakawa, M. P. Geraldes, P. Camelier & P. Moura. UFBA 6188, 1, 79.3 mm SL, rio Paraguaçu at Fazenda Os Touros, ca. 18 km from Nomenclature and counts of body plates follow Schaefer Iaçu, 12°41’10”S 40°7’47”W, 15 May 2010, A. M. Zanata, R. Burger, (1997). Standard length (SL) is expressed in millimeters C. Primitivo, D. França & J. J. S. Conceição. UFBA 7350, 6, 30.5- while all other measurements are given as percents of SL, 80.9, rio Una at Cachoeira das Andorinhas, Iramaia, 13°19’52.5”S except for subunits of the head, which are presented as 41°6’53.4”W, 449 m a.s.l., 1 May 2013, A. M. Zanata, R. Burger, L. percents of the head length (HL). Counts of procurrent Oliveira & R. Abreu. caudal-fin rays and vertebrae were made only in cleared and counterstained specimens (c&s) prepared according Diagnosis. Pareiorhaphis lophia differs from all congeners to Taylor & Van Dyke (1985). Vertebral counts comprise in having two exclusive features: (1) a skin fold just posterior all vertebrae including the five centra modified into the to each emergent tooth series of dentary formed by a single Weberian apparatus and the compound caudal centrum enlarged, flattened papilla, and (2) the midline of lower lip (PU1+U1) was counted as one element. Meristic and immediately behind the dentaries with small patch of distinct morphometric data for comparisons of Pareiorhaphis species papillae arranged in a short median bump (vs. papillae not in the diagnosis section are from Pereira & Reis (2002), projected in a bump). Moreover, the lower caudal peduncle Pereira (2005), Pereira et al. (2007, 2010), Pereira & Britto also distinguishes P. lophia from all remaining Pareiorhaphis (2012), and Pereira et al. (2012). Institutional abbreviations species (6.7-7.8 vs. 7.8-14.0% SL), with the exception of are: Museu de Ciências e Tecnologia, Pontifícia Universidade P. proskynita. Furthermore, P. lophia can be distinguished Católica do Rio Grande do Sul, Porto Alegre (MCP); from remaining congeners but P. bahianus, P. cerosus, P. Museu de Zoologia, Universidade de São Paulo, São Paulo eurycephalus, P. nudulus, P. parmula, P. steindachneri, and (MZUSP); and Universidade Federal da Bahia, Salvador P. vestigipinnis by the lower number of dentary teeth (20- (UFBA). Descriptions of coloration were based on specimens 38 vs. 42-120). Pareiorhaphis lophia can be distinguished preserved in ethanol and photographs of the freshly collected from P. bahianus, P. cerosus, P. eurycephalus, P. parmula, specimens. In the lists of examined material the museum and P. steindachneri by the usual absence of first dorsal-fin abbreviation and catalog number come first, followed by the spinelet (vs. spinelet present). The new species can be further number and SL range of specimens in that lot, the number distinguished from P. nudulus and P. vestigipinnis by the and SL range of specimens measured for the morphometric possession of an adipose fin (vs. adipose fin absent) and the comparisons, in parentheses, and locality. narrower caudal peduncle (4.1-5.3 vs. 5.5-8.7% SL). Adult males of Pareiorhaphis are herein defined according to Pereira et al. (2007). The specimens included in the list of Description. Counts and measurements in Table 1. Small to material examined are a combination of male, female and medium-sized loricariid with standard length of measured immature specimens of both sexes. specimens 45.5-82.1 mm SL. Head and body moderately depressed. Greatest body width at cleithrum, progressively Results tapering to end of caudal peduncle. Dorsal profile of body slightly convex, from snout tip to dorsal-fin origin and Pareiorhaphis lophia, new species almost straight from that point to end of adipose fin, then Figs. 1-3 slightly concave to caudal fin. Greatest body depth at dorsal- fin origin. Least body depth at shallowest part of caudal Holotype. MCP 47711, 76.9 mm SL, male, Brazil, Bahia State, peduncle. Trunk and caudal peduncle mostly oval in cross- Lençóis, rio Paraguaçu drainage, rio Santo Antônio at bridge on road section, flattened ventrally and more compressed caudally. BR-242, 12°29’37”S 41°19’38”W, 350 m above sea level, 7 Jul 2011, Lateral-line canal in median series complete, pored tube A.
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